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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4612a70f20ea2375807b943e590469cd9d5b6013033e8cd9c2dab22e6325843' 
  AND token = 'D/1TeU1IASsN98g5xfVeBTZa9dMsrhJY1UIHXP6FDr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}